Regeneration radiotransformer



Aug. 17 1926. v

R. BELL REGENERATION RADIO TRANSPORIBR Filed Sept. 6. 1924 2:...ii-ii-nlllillllll'l Patented Aug. 17, 1928.

nomr Banner NEW HAVEN,

CONNECTICUT, ASSIGNOB TO THE NEW HAVEN,

FARADAY 00., or commcnoor.

REGENERATION RADIO'IBA NSFOBMEB.

Application flledSeptemberB, 1924. Serial No. 736,266.

I do hereby declare the following, when taken in connection with theaccompanying drawings and the characters of reference marked thereon, tobe a full, clear, and

I exact description of the same, and which said drawings constitute partof this application, and represent, in

Fig. 1 a side view of a regeneration radio transformer constructed inaccordance with my invention.

Fig. 2 a rear view of the same.

Fig. 3 a sectional view on the line 33 of Fig. 2 on an enlarged scale.

4 a schematic perspective view illus- 16 trating the relative positionof the coils and disk.

In radio sets, a transformer is employed having two coils havinginductive effect one upon the other, but such devices do not pro- 80duce the desired clearness. The object of this invention is to controlthe inductive effect of one coil upon the other coil of a tuningapparatus from zero to its full capacity, and the invention consists inthe construction as hereinafter described and particularly recited inthe claim.

In carrying out my invention, I employ a block 10 of insulatingmaterial, preferably formed with an annular groove 11 50 which containsa secondary coil 12 and a primary coil 13, each being connected with twobinding-posts IP14 and 15-15 mounted on the-periphery of the block 10.In the block is an internally-threaded bushin 85 16 throughwhich extendsa screw-stem 1 car a knurled finger-piece 18. Fixed to tie inner end ofthe stem 17 is a metalsulating material I block, a screw-stem lic disk19 corresponding substantially in diameter to the diameter of the block,the disk being secured to the stem b a flange 20. By turning the stemoutward, the disk is drawn toward the insulating block and consequentlytoward the coils 11 and 12, in which position, as shown in Fig. 3 of thedrawin the tendency of the disk is to completeI; the primary 11 upon thesecondary 12. The reverse movement of the stem 17 moves the disk 19 awayfrom the block 10 with gradually decreasing nullifyin effect upon theinductive action between the primary and the secondary, until, in itsextreme retired position, its nullifying effect is practically nil.

IVhile I have referred to the coils as primary and secondary, this isfor the purpose of description only, as in some cases both may beprimary or any event, I control the tween two coils, where circuitsknown as tuned anodes are used.

I claim:

A transformer, comprising a block of ininternally-threaded bushingmounted in the extendlng through said bushing, and a metal disk mountedon the inner'end of the stem and adapted to be moved toward and from cthe said block, whereby the inductive efiect of one coil upon the othermay be varied.

In testimony specification.

ROBERT BELL.

whereof, I have signed this nullify the inductive effect of bothsecondary. In." coupling effect be- I carrying twocoils, an

